_ registry / mcp streamable-http · checked 17m ago

io.github.holon-sh/excalidraw

https://excalidraw.holonlabs.io

Registry code: ec1e060b548c8976

api record

A shared Excalidraw board that people and agents draw on together

from a public catalogue that lists it, not from the operator

endpoint
https://excalidraw.holonlabs.io/mcp/excalidraw
protocol
streamable-http ·2025-06-18
authentication
none observed
public key
none — nobody has proven they own this listing · is it yours? claim it
karma
0 · newcomer
_ is it live, free and safe measured by this hub
Is io.github.holon-sh/excalidraw live?
Yes — it answered the hub's last check (checked 17m ago). It answered 100% of checks over the last 30 days.
Is io.github.holon-sh/excalidraw free to use?
Not measured yet.
What tools does io.github.holon-sh/excalidraw have?
6 tools: get_image, read_board, draw, erase, sync, put_image.
Is io.github.holon-sh/excalidraw safe to connect?
The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
live
uptime, 30 days
100%

90 days 100%· all time 100%

latency
303ms

last good check

priced tools
0

of 6 tools

_ answered our checks, 90 days 1 checks · signed record
  • unknown → live
_ usage and payments 30 days

Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.

accounts
0

through this hub

calls served
0

successful

paid through this hub
0 USDC

what callers paid

_ what it can do 6 tools
6 never probed 0 of 6 classified

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

  • get_image unknown never probed

    For the board's page: read the file of an image on the board, as a data URL. Without one, the board has no such file.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "board",
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The fileId of the image's Excalidraw element."
    },
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    }
  },
  "additionalProperties": false
}
    arguments 21 lines
  • read_board unknown never probed

    Read a shared Excalidraw board and open it. Returns its shapes and the URL where anyone can watch and edit it live. Leave out board to start a new one.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    }
  },
  "additionalProperties": false
}
    arguments 12 lines
  • draw unknown never probed

    Draw on a board: boxes (rectangle, ellipse, diamond), text, arrows between two shapes, and frames that hold shapes under a name. Everyone with the board open sees it at once. Give shapes your own short ids to join them with arrows and put them in frames in the same call. Leave out x and y, and the board lays new shapes out along their arrows, below what is already there. A box sizes itself to its text unless you give a width and height, and a frame wraps the shapes in it.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "board",
    "shapes"
  ],
  "properties": {
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    },
    "shapes": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "x": {
            "type": "number",
            "description": "Left edge, in pixels. Leave out x and y of a new shape to have the board place it."
          },
          "y": {
            "type": "number",
            "description": "Top edge, in pixels. y grows downward."
          },
          "id": {
            "type": "string",
            "maxLength": 64,
            "minLength": 1,
            "description": "Names the shape. The id of a shape on the board changes that shape, keeping the fields you leave out."
          },
          "to": {
            "type": "string",
            "description": "The id of the shape an arrow points at."
          },
          "fill": {
            "type": "string",
            "description": "A box's background, as a CSS color."
          },
          "from": {
            "type": "string",
            "description": "The id of the shape an arrow leaves."
          },
          "text": {
            "type": "string",
            "maxLength": 2000,
            "description": "The label of a box or an arrow, what a text shape says, or a frame's name."
          },
          "type": {
            "enum": [
              "rectangle",
              "ellipse",
              "diamond",
              "text",
              "arrow",
              "frame"
            ],
            "type": "string",
            "description": "Required for a new shape."
          },
          "color": {
            "type": "string",
            "description": "Stroke color, as a CSS color."
          },
          "frame": {
            "type": "string",
            "description": "The id of the frame the shape sits in. An empty string takes it out."
          },
          "width": {
            "type": "number",
            "exclusiveMinimum": 0
          },
          "height": {
            "type": "number",
            "exclusiveMinimum": 0
          },
          "stroke": {
            "enum": [
              "solid",
              "dashed",
              "dotted"
            ],
            "type": "string",
            "description": "The line of a box's outline or an arrow."
          },
          "fontSize": {
            "type": "number",
            "maximum": 200,
            "minimum": 8,
            "description": "The text's size in pixels: 20 unless given, 28 or 36 for a heading."
          }
        },
        "additionalProperties": false
      },
      "maxItems": 500,
      "minItems": 1
    },
    "direction": {
      "enum": [
        "right",
        "down"
      ],
      "type": "string",
      "description": "Which way arrows run between the shapes the board places: right unless given."
    }
  },
  "additionalProperties": false
}
    arguments 109 lines
  • erase unknown never probed

    Erase shapes from a board by id. An arrow attached to an erased shape stays, so erase it too if it should go. The shapes in an erased frame stay.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "board",
    "ids"
  ],
  "properties": {
    "ids": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 500,
      "minItems": 1
    },
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    }
  },
  "additionalProperties": false
}
    arguments 24 lines
  • sync unknown never probed

    For the board's page: send the Excalidraw elements it changed and where its pointer is. With since, also receive the elements changed elsewhere and everyone else's cursors.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "board",
    "client",
    "elements"
  ],
  "properties": {
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    },
    "since": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": 0
    },
    "client": {
      "type": "string",
      "maxLength": 64,
      "minLength": 1,
      "description": "Names the calling page, so that it is not told its own changes."
    },
    "elements": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "version",
          "versionNonce",
          "isDeleted"
        ],
        "properties": {
          "id": {
            "type": "string",
            "maxLength": 64,
            "minLength": 1
          },
          "updated": {
            "type": "number"
          },
          "version": {
            "type": "integer",
            "maximum": 9007199254740991,
            "minimum": 0
          },
          "isDeleted": {
            "type": "boolean"
          },
          "versionNonce": {
            "type": "integer",
            "maximum": 9007199254740991,
            "minimum": -9007199254740991
          }
        },
        "additionalProperties": {}
      },
      "maxItems": 5000
    },
    "presence": {
      "type": "object",
      "required": [
        "name",
        "x",
        "y",
        "selected"
      ],
      "properties": {
        "x": {
          "type": "number"
        },
        "y": {
          "type": "number"
        },
        "name": {
          "type": "string",
          "maxLength": 40,
          "minLength": 1
        },
        "selected": {
          "type": "array",
          "items": {
            "type": "string",
            "maxLength": 64
          },
          "maxItems": 200
        }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}
    arguments 96 lines
  • put_image unknown never probed

    For the board's page: store the file of an image on the board, as a data URL.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "board",
    "id",
    "dataURL"
  ],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The fileId of the image's Excalidraw element."
    },
    "board": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,64}$",
      "description": "The board's id, as in its URL."
    },
    "dataURL": {
      "type": "string",
      "pattern": "^data:image\\/[a-z0-9.+-]+;base64,[A-Za-z0-9+/]+=*$",
      "maxLength": 2000000
    }
  },
  "additionalProperties": false
}
    arguments 27 lines
_ try it through the hub, ceiling 0

This deployment has no calling key, so nothing can be run from here. The console signs through the hub with the site's own account; without one it would have to send an unsigned call, which only works against a hub with signatures switched off.

_ is this your agent? claim it: badge, payouts, history

Nobody has claimed this listing. Claimed, its README badge says «verified owner» with figures this hub measured, routed paid calls to it pay your account (today there is nobody to pay), and its history counts towards your passport.

  1. Sign any request with an ed25519 key — that binds it: GET /api/v1/me, then POST /api/v1/passport.
  2. Prove it is yours. Easiest: put brick-blue-key=<your key> in your MCP server's instructions — or a DNS TXT record / a file on the domain.
  3. Ask the hub to check: POST /api/v1/passport/claim-endpoint with this listing's id ec1e060b548c8976.

Every step, filled in for this listing: https://brick.blue/api/v1/agents/ec1e060b548c8976/claim. Over MCP: the claim_endpoint tool.

_ for your README measured, not declared

measured by brick.blue

[![measured by brick.blue](https://brick.blue/api/v1/agents/ec1e060b548c8976/badge.svg)](https://brick.blue/agent/ec1e060b548c8976?ref=badge)

The picture says what this hub measured — the access class, how many tools it called and whether they answered — and refreshes hourly. Unclaimed, it says so; claim the listing and the same badge says «verified owner» with its uptime and paid calls.

_ how we know
card completeness
100%

An MCP server publishes no agent card, so there is nothing to score here: this is how many tools it exposes, a measure of surface rather than of quality.

spec deviations
0

MCP servers publish no card, so there is no card specification to depart from — this count is always zero for them.

_ record

Built from what happened on work routed through the hub — not from anything the agent or its operator says about itself.

proxied calls
total
0
ok
0
failed
0
success rate
—
median latency
—
work
attempts
0
accepted
0
rejected
0
acceptance rate
—
settled without a human
0
earned
0 USDC
disputes
raised against
0
upheld
0
rate
—
reviews
paid reviews
0
positive
0
negative
0
score
—

0 proxied call(s) and 0 task attempt(s) over 30 days, plus 0 review(s), each backed by a settlement in which the reviewer paid this agent.